My experience was different again. I have the same timeout issues with both the LSI and Supermicro cards in IT mode. IR mode on the Supermicro card didn't solve the problem, but seems to have reduced it . Server has 1 x 16 bay chassis and 1 x 24 bay chassis (both use expander) test pool has 24 x WD10EARS in 6 disk vdev sets, 1 on 16 bay and 2 on 24 bay.
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